One server goes down. Nobody can buy anything.
How Azure Availability Zones keep an Amazon-scale shopping app online while an entire datacenter fails.
What you'll learn
- What a single-server outage actually costs a shopping app
- How three zones in one region are physically separate buildings
- Why sub-2 ms replication turns 99.9% into 99.99%
Share this passage
Drawing…
Understand it one step at a time
The short runs these in order in about 32 seconds. Here they are written out — pick any step to jump the short straight to it.
Millions of shoppers, one shop
Millions of shoppers, one shop, one physical building. Logins, carts and checkouts all land on that same single server.
Frequently asked questions
- What is an Azure Availability Zone?
- A physically separate location within an Azure region — its own datacenter, power and networking — connected to the other zones in that region by low-latency fibre, typically under 2 ms. Spreading VMs across zones survives a whole datacenter going down, not just a single server.
- How much does spreading across zones actually buy you?
- On paper the jump from a single-zone deployment to three zones is roughly 99.9% to 99.99% availability — the difference between about 8.7 hours of downtime a year and about 52 minutes.
Free app · no app store
These are built for a phone
Every short is drawn at full portrait height, the shape a phone already is. Installed, it opens full-bleed with no address bar across the top — and the whole library reads offline.
Read deeper on Azure
Twenty seconds gets the shape of an idea across. These go into how it behaves in production.
-
How Azure Protects a Mobile App: The Full Request Flow, Layer by Layer
Front Door, your API, Microsoft Entra ID, authorization and a private database — the five layers that stand between a mobile app and its data on Azure.
-
Your Mobile App Is Leaking Its API Key — and Obfuscation Will Not Save It
An APK or IPA is a zip file. Anything hardcoded inside it, including your API key, is already public — and here is how to get it off the phone for good.
-
What Is Microsoft Foundry (Azure AI Foundry)? The Services, and When You Actually Need Them
A plain tour of Microsoft Foundry for developers: the resource, projects, models, agents, tools, and when Azure OpenAI on its own is enough.
More shorts
-
Azure
Secure a Mobile API in 5 Steps
8 steps · 25s
-
Azure
What Happens When You Tap Sign In
8 steps · 25s
-
Azure
Your Mobile App Is Leaking Its API Key
8 steps · 26s
Get new posts by email
New technical articles, Azure AI and GitHub Copilot updates, and upcoming events. No spam, unsubscribe anytime.
MSDEVBUILD
/ blog Multi-Stack Dev Build · by Suthahar Azure